JP2002021012A - Method for finishing elastically paved surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for finishing an elastically paved surface, by which a non-slip effect can be continued for a prolonged term. SOLUTION: This method for finishing the elastically paved surface forms a surface finishing layer by coating the surface of an elastic paving-material layer with paints containing a polyurethane resin and polymer beads, and projecting the polymer beads coated with the polyurethane resin from a surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finishing an elastic pavement surface used in an athletic stadium, a multipurpose athletic field or the like.

[0002]

2. Description of the Related Art Conventionally, in athletic stadiums and multipurpose stadiums with all-weather pavement, the surface of an elastic pavement material layer is subjected to uneven finishing so that athletes and the like do not slip. For example, Japanese Patent Application Laid-Open No. 58-29902 discloses a method of improving slip resistance by applying a coating material containing glass beads to the surface of an elastic layer. Patent 266
Japanese Patent No. 4846 discloses a method in which a material in which micro hollow spheres are added to a thixotropic polyurethane material is applied to a resin pavement surface made of a polyurethane resin to expose the micro hollow spheres to the surface.

[0003]

However, in the method described in Japanese Patent Application Laid-Open No. 58-29902, the specific gravity of the glass beads is too heavy, so that the glass beads are separated when mixed with other coating materials. There is. Further, in the method described in the above-mentioned Japanese Patent No. 2664846, since the minute hollow spheres are exposed on the surface of the resin pavement, the minute hollow spheres may be broken by external pressure during use such as shoe soles or light vehicles after construction, There is a drawback that it is easily detached and the anti-slip effect does not last for a long time.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for finishing an elastic pavement surface that can maintain a non-slip effect for a long period of time.

[0005]

In order to achieve the above object, a method for finishing an elastic pavement surface according to the present invention comprises applying a paint containing a polyurethane resin and polymer beads to the surface of an elastic pavement material layer, The structure is such that polymer beads coated with a polyurethane resin form a surface finishing layer formed by projecting on the surface.

[0006] That is, the present inventors have intensively studied to obtain a method for finishing an elastic pavement surface which can maintain a non-slip effect for a long period of time. As a result, a coating containing a polyurethane resin and polymer beads is applied to the surface of the elastic pavement material layer to form a surface finishing layer in which the polymer beads coated with the polyurethane resin project on the surface. The polymer beads coated with polyurethane resin are almost uniformly distributed on the surface of the surface, and the surface of the surface finishing layer becomes uneven, so that the polymer beads are hard to be detached and the anti-slip effect can be maintained for a long time They have found that they can do so and have reached the present invention.

Further, when the specific gravity and the average particle size of the polymer beads are set within a predetermined range, the polymer beads are not separated and the dispersibility of the polymer beads in the paint becomes more uniform, and the surface of the surface finishing layer is coated with polyurethane. The polymer beads coated with the resin can be more uniformly dispersed.

Further, when the polymer beads have a functional group that chemically reacts with the isocyanate group of the polyurethane resin, the adhesion between the polymer beads and the polyurethane resin becomes stronger, and the polymer beads detach from the surface. Therefore, it is possible to form a surface finish layer having more excellent durability.

When the coating amount of the paint is set within a predetermined range, the formation of the surface finishing layer on the surface of the elastic pavement material layer is further improved.

[0010]

Next, an embodiment of the present invention will be described.

In the method for finishing the surface of an elastic pavement according to the present invention, a coating containing a polyurethane resin and polymer beads is applied to the surface of the elastic pavement material layer, and the polymer beads coated with the polyurethane resin project on the surface. This is a method of forming a surface finishing layer.

The polyurethane resin used as a main component of the above-mentioned paint is not particularly limited as long as it is a one-pack type or a two-pack type, as long as it is a polyurethane resin used in ordinary paints. Is preferably used. Examples of the two-pack type polyurethane resin include a polyurethane prepolymer (A) comprising a polymer polyol and an organic polyisocyanate and having two or more free isocyanate groups.
Component) and a curing agent (component (B)) comprising a polymer polyol, an aromatic diamine, an aliphatic diamine and the like.

As the polyurethane prepolymer (component A) comprising the above-mentioned high molecular polyol and organic polyisocyanate and having two or more free isocyanates, any one may be used. A polyether urethane prepolymer or acryl urethane prepolymer (X) containing at least two free isocyanate groups and a polyether urethane prepolymer or acryl urethane prepolymer (Y) having two free isocyanate groups, wherein X: Y is 2 : 8 ~
Those formulated to be 9: 1 are particularly preferred. This is because polyurethane and polyurea urethane derived from such a prepolymer have a high crosslinking density and are excellent in strength, elasticity, heat resistance and the like.

The polymer polyol used as the curing agent (component B) is a polymer compound (polymer) having two or more free hydroxyl groups and capable of undergoing an addition reaction with an organic polyisocyanate.
And a polyalkylene ether obtained by addition polymerization of an alkylene oxide such as ethylene oxide, propylene oxide, trimethylene oxide to a diol such as ethylene glycol or propylene glycol or a triol such as trimethylolpropane, glycerin or hexanetriol. And polyols (having two or more hydroxyl groups in one molecule and having an average molecular weight of 400 to 4000). Also, an acrylic polyol which is an acrylic copolymer having two or more free hydroxyl groups can be used, and examples thereof include β-hydroxyethyl acrylate, β-hydroxyethyl methacrylate, β-hydroxypropyl acrylate, and β-hydroxypropyl methacrylate. A copolymer of a hydroxyl group-containing monomer, a monomer capable of providing a hard polymer such as SM and methacrylic acid ester, and a carboxylic acid group-containing monomer such as acrylic acid and methacrylic acid is preferred. As such a commercially available product, Hirotite 3001, 3004, manufactured by Hitachi Chemical Co., Ltd.
3006, Rastrazole A-80 manufactured by Dainippon Ink and Chemicals, Inc.
1, A802, A805, and A807.

The aromatic diamine optionally used as the curing agent (component B) includes, for example, methylenebisorthochloroaniline, 2,2'-dichlorobenzidine,
Preferred are 3-bisaminomethylbenzene, m-tolylenediamine and the like.

Examples of the aliphatic diamine used as necessary for the curing agent (component B) include ethylene diamine, propylene diamine, hexamethylene diamine, and the like.
1,2-propylenediamine and the like can be mentioned.

The curing agent (component B) may contain a reaction accelerator, an inorganic filler and the like.

Examples of the reaction accelerator include lead octylate,
Organic metal salts such as tin octylate and dibutyltin laurate and tertiary amines such as triethylenediamine are used. It is preferable that the amount of these used is set to 0.1 to 1% by weight of the whole paint.

As the inorganic filler, any inorganic filler may be used as long as it can be blended and used with ordinary elastic pavement materials. Examples thereof include heavy calcium carbonate, aluminum hydroxide, silica, and higher fatty acid metal. Salt (sodium salt,
Calcium carbonate surface-treated with potassium salt, calcium salt, magnesium salt, aluminum salt, etc.) is preferred. In particular, calcium carbonate surface-treated with the above higher fatty acid metal salt is most suitable because it also exhibits the effect of the thixotropic agent. It is preferable that the amount of these used is set to 10 to 50% by weight of the whole paint.

The polymer forming the polymer beads used together with the polyurethane resin is not particularly limited as long as it is an organic polymer. For example, hot melts such as copolymerized polyamide, polyurethane, copolymerized polyester, polyethylene, ethylene-vinyl acetate, etc. Examples include those used for adhesives. Among these, copolymer polyamide and copolymer polyester are preferably used because of their high adhesive strength to urethane resin.

The polymer forming the polymer beads preferably has a functional group that chemically reacts with the isocyanate group of the polyurethane resin, and examples of the functional group include a hydroxyl group and an amino group.

The amount of the polymer beads is preferably set in the range of 2 to 20 parts, more preferably 5 to 10 parts, per 100 parts by weight (hereinafter abbreviated as "parts") of the polyurethane resin. Department. That is, if the compounding amount of the polymer beads is less than 2 parts, the anti-slip effect may be reduced, and if it exceeds 20 parts,
This is because there is a possibility that the resin enters the concave portion of the uneven surface and loses a soft feeling in the hardness of the surface or the target uneven pattern changes.

As the polymer beads, those having a specific gravity close to the specific gravity of the polyurethane resin are usually used, preferably those having a specific gravity of 0.5 to 1.4 are used, and particularly preferable are those having a specific gravity of the polymer beads. 0.8 ~
1.2 is used.

The shape of the polymer beads is not particularly limited, and is intended to include powder and the like. The average particle diameter of the polymer beads is 1.0 mm in terms of dispersibility.
The following is preferable, and particularly preferable is a range of 0.1 to 0.5 mm.

As the polymer beads, substantially non-porous ones are used. In the present invention, “substantially non-porous” means that it is not porous (sponge-like) according to common sense, and has a meaning that a small number of holes or cracks may be present.

The paint used in the present invention includes organic solvents (aromatic solvents such as toluene and xylene, alkyl acetates and the like which do not react with isocyanate groups),
Conventional additives such as weather stabilizers, color pigments, light stabilizers, and plasticizers may be blended as required.

The viscosity of the paint used in the present invention is usually 20
The temperature is set in the range of 1000 to 10000 mPa · S, and the thixotropic index (TI value) is
Usually, it is set in the range of 1.2 to 4. By setting the viscosity and the TI value of the paint in the above-mentioned predetermined ranges, the non-slip property, abrasion resistance and the like of the obtained surface finishing layer are improved.

In order to adjust the viscosity and the TI value of the paint to the above ranges, higher fatty acids, higher alcohols,
It is desirable to add calcium carbonate surface-treated with a higher fatty acid metal salt or the like or a liquid thixotropic agent (known), and among these, calcium carbonate surface-treated with a higher fatty acid metal salt is most preferable.

The method of applying the paint is not particularly limited.
Examples of the method include spray coating, roller brush coating, and brush brush coating.

The coating amount of the paint is preferably set in the range of 0.08 to 1.0 kg per 1 m ² of the surface of the elastic pavement layer, particularly preferably 0.12 to 0.1 kg.
7 kg.

In the present invention, the elastic pavement layer to which the coating material is applied is preferably made of a polyurethane resin material.

Next, examples will be described together with comparative examples.

[0033]

First, an excess of tolylene diisocyanate (2,4 adduct / 2,6 adduct = 80/2) was added to polyoxypropylene glycol (average molecular weight: 2,000) and polyoxypropylene triol (average molecular weight: 5,000).
0) was reacted in a conventional manner to prepare a prepolymer having a terminal isocyanate group content of 3.0% by weight. In addition, 44 parts of a liquid polyamine containing methylenebisorthochloroaniline, polyoxypropylene glycol (average molecular weight 3000) and polyoxypropylene triol (average molecular weight 5000), 6 parts of pigment, and 44 parts of heavy calcium carbonate
Part, 3 parts of dioctyl phthalate, 2 parts of lead octylate (reaction accelerator) and 1 weather-resistant stabilizer (Nocrack NBC)
A curing agent consisting of parts was prepared. Then, the prepolymer and the curing agent are mixed at an NCO / H equivalent ratio of 1.05, and the mixture is poured onto an asphalt concrete base,
After paving a polyurethane resin having a thickness of about 10 mm, a material obtained by mixing ultrafine particulate silica (Ezil 200) with the same material and imparting thixotropy is applied in an embossed shape by spraying so as to have a thickness of 2 mm. Formed an elastic pavement material layer surface having irregularities of about 2 mm on average.

On the other hand, 100 parts of top coat KBK-NYB (a thixotropic material having a solid content of about 50% by weight, manufactured by Nippon NSC, Inc.) containing two-pack acrylic urethane resin as a main component (50 parts of chelesin) were mixed with a polymer. Copolymerized polyamide beads (made by Elf Atochem Japan,
Platamide PA250) (average particle size 0.2 mm, specific gravity 1.08) was added and mixed to prepare a coating material. Then, an airless spray (B) is applied to the surface of the elastic pavement layer so that the coating amount is 0.15 kg / cm ^2.
inks). Then, this was left as it was and naturally cured to form a surface finish layer having irregularities in which polymer beads coated with a polyurethane resin were distributed almost uniformly on the surface.

The surface finish layer thus obtained was evaluated for slip resistance coefficient and wear resistance. The slip resistance coefficient was evaluated according to the measurement method of the British Road Traffic Research Institute, and the wear resistance was evaluated according to JIS K7204. As a result, the slip resistance coefficient was as good as 72 in WET, and the wear resistance was 0.05 g. After the abrasion test, when the surface was observed with a microscope (magnification: 1000 times), the detachment rate of the polymer beads was 0%.

[0036]

Comparative Example A surface finishing layer was formed in the same manner as in Example except that alumina silicate-based micro hollow spheres (average particle diameter: 0.2 mm) were used instead of the polymer beads (copolymerized polyamide beads). . And about this surface finish layer, the sliding resistance coefficient and the abrasion resistance were evaluated like Example. As a result, although the slip resistance coefficient was 70 in WET, which was not much different from that of the example, the abrasion resistance was 0.22 g, and the detachment rate of the minute hollow spheres was as high as 25%.

[0037]

As described above, the method for finishing the surface of an elastic pavement according to the present invention comprises the steps of applying a coating containing a polyurethane resin and polymer beads to the surface of an elastic pavement material layer and coating the polymer with a polyurethane resin. This is to form a surface finishing layer in which beads project on the surface. According to the present invention, polymer beads coated with a polyurethane resin are substantially uniformly distributed on the surface of the surface finishing layer, and the surface of the surface finishing layer becomes uneven, so that the polymer beads are less likely to be detached and are non-slip. The effect can be maintained for a long time. In addition, a matting effect on the surface can be obtained.

When the polymer beads have a functional group that chemically reacts with the isocyanate group of the polyurethane resin, the adhesion between the polymer beads and the polyurethane resin becomes stronger, and the polymer beads are detached from the surface. Therefore, it is possible to form a surface finish layer having more excellent durability.

Further, when the specific gravity and the average particle diameter of the polymer beads are set within a predetermined range, the polymer beads are not separated and the dispersibility of the polymer beads in the coating material becomes more uniform, and the surface of the surface finishing layer is coated with polyurethane. The polymer beads coated with the resin can be more uniformly dispersed.

When the coating amount of the paint is set within a predetermined range, the formation of the surface finishing layer on the surface of the elastic pavement material layer is further improved.

Claims (4)

[Claims] An object of the present invention is to apply a paint containing a polyurethane resin and polymer beads to the surface of an elastic pavement material layer to form a surface finishing layer in which the polymer beads coated with the polyurethane resin project on the surface. A characteristic method of finishing elastic pavement surfaces. 2. The polymer beads having a specific gravity of 0.5 to 1.4.
The method of finishing an elastic pavement surface according to claim 1, wherein the average particle diameter of the polymer beads is 1.0 mm or less. 3. The method for finishing an elastic pavement surface according to claim 1, wherein the polymer beads have a functional group which chemically reacts with an isocyanate group. 4. The coating amount of a coating material containing a polyurethane resin and polymer beads is 0.08 to 1 / m ² .
The method for finishing an elastic pavement surface according to any one of claims 1 to 3, wherein the weight is 0 kg.